This. Even tough when it comes to the amount of content I believe the tables will turn around next episode (the other path content was axed and moved to the E18?), I'm dissatisfied with this whole branching story and the reasoning behind it seems completely made up and out of the blue. It is literally never even slightly hinted or shown that Titania's and Taka's characters and their stories are connected in any way. If it was on me, I'd change the dialogues during WTC part, to maybe show Titania's hesitation about the reasons behind Taka? Or some compassion and sympathy from anyone towards Taka? Or just make the diary part being decisive here, then the whole reasoning brought to us in this post would actually make more sense - it was Titania that was afraid of revealing the truth, if the player chooses to reveal it, this could work as an eye-opener for Titania, that the truth is better choice than living in a lie? After all, why would Taka want to sacrifice himself (in fact only) for Titania?
Not to mention the more we interact with Amaria, the more I understand why everyone wants to escape from her. It's just Titania's resillence and inner strenght that prevented her from doing it long ago, but it only entangled her and twisted her within Amaria's tormented soul, which is completely hopeless. Well, if Zerkrom's path ends up with Amaria realising she's torturing Titania, that only she can overcome her problems and eventually she lets Titania go, then it would be the good ending. I don't know how much of this story is based on real events and if this is even possible.